Energy or speed needed to escape from the surface, a height or an orbit

1. A.
   $11.2(\sqrt{2} - 1)km/s$
2. B.
   $7.9(\sqrt{2} - 1)km/s$
3. C.
   $8(\sqrt{2} - 1)km/s$
4. D.
   $7.4(\sqrt{2} - 1)km/s$

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1. A.
   $2{mgR}_{E}$
2. B.
   ${mgR}_{E}$
3. C.
   $\frac{1}{2}{mgR}_{E}$
4. D.
   $4{mgR}_{E}$

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1. A.
   A False but $R$ is true
2. B.
   Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
3. C.
   $A$ is true but $R$ is false
4. D.
   Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$

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1. A.
   $\sqrt{\frac{GM}{2R}}$
2. B.
   $\sqrt{\frac{GM}{R}}$
3. C.
   $\sqrt{\frac{3GM}{R}}$
4. D.
   $\sqrt{\frac{2GM}{R}}$

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